Select N previous and M next items around current item id - mysql

Question

I have a table with photos
id | year| comm_count
0 2015 1
1 2016 2
2 2017 5
3 2018 7
4 2019 1
5 2020 9
6 2021 1
7 2022 1
I select photo with a given id, somewhere in the middle of all photos. For example like this:
SELECT *
FROM photo
WHERE year > '2017'
ORDER BY comm_count DESC, year DESC
This will give me:
5,3,7,6,4
This gives me list of all photos. Now, I write this list on my web, but user can click on one certain photo. After that, detailed page opens. But from this detailed page, I would like to be able to go to "next" M and "previous" N photos. This means, I need to select neihboring IDs based on currenttly selected one. How can this be done?
Now I select id = 7 and I want neighbors to be:
prev: 5,3 and next: 6,4. How can this be selected?
SqlFiddle - http://sqlfiddle.com/#!9/4f3f42/4/0
I cannot run the same query and filter results in PHP, because query can contain LIMITS (eg. with LIMIT 2, 4 I still the need correct neighbors)

Answer 1

Once you have the year and comm_count values for the selected row with id=7, you can make two simple queries:
SELECT * FROM photo
WHERE year > 2017 AND (comm_count = 1 AND year <= 2022 OR comm_count < 1)
ORDER BY comm_count DESC, year DESC LIMIT 3 OFFSET 1
+----+------+------------+
| id | year | comm_count |
+----+------+------------+
| 6 | 2021 | 1 |
| 4 | 2019 | 1 |
+----+------+------------+
SELECT * FROM photo
WHERE year > 2017 AND (comm_count = 1 AND year >= 2022 OR comm_count > 1)
ORDER BY comm_count ASC, year ASC LIMIT 3 OFFSET 1;
+----+------+------------+
| id | year | comm_count |
+----+------+------------+
| 3 | 2018 | 7 |
| 5 | 2020 | 9 |
+----+------+------------+
If you use MySQL 8.0, you can use the LAG() and LEAD() functions.
SELECT id, year,
LAG(id, 1) OVER w AS next,
LAG(id, 2) OVER w AS next_next,
LEAD(id, 1) OVER w AS prev,
LEAD(id, 2) OVER w AS prev_prev
FROM photo
WHERE year > 2017
WINDOW w AS (ORDER BY comm_count DESC, year DESC)
+----+------+------+-----------+------+-----------+
| id | year | next | next_next | prev | prev_prev |
+----+------+------+-----------+------+-----------+
| 5 | 2020 | NULL | NULL | 3 | 7 |
| 3 | 2018 | 5 | NULL | 7 | 6 |
| 7 | 2022 | 3 | 5 | 6 | 4 |
| 6 | 2021 | 7 | 3 | 4 | NULL |
| 4 | 2019 | 6 | 7 | NULL | NULL |
+----+------+------+-----------+------+-----------+